using System;
using System.Collections.Generic;
using System.Linq;

namespace System.Data
{
	public static class EnumerableRowCollectionExtensions
	{
		public static EnumerableRowCollection<TResult> Cast<TResult> (this EnumerableRowCollection source)
		{
			return new EnumerableRowCollection<TResult> (Enumerable.Cast<TResult> (source));
		}

		public static OrderedEnumerableRowCollection<TRow> OrderBy<TRow, TKey> (this EnumerableRowCollection<TRow> source, Func<TRow, TKey> keySelector)
		{
			return OrderBy<TRow, TKey> (source, keySelector, Comparer<TKey>.Default);
		}

		public static OrderedEnumerableRowCollection<TRow> OrderBy<TRow, TKey> (this EnumerableRowCollection<TRow> source, Func<TRow, TKey> keySelector, IComparer<TKey> comparer)
		{
			return OrderedEnumerableRowCollection<TRow>.Create<TRow, TKey> (source, keySelector, comparer, false);
		}

		public static OrderedEnumerableRowCollection<TRow> OrderByDescending<TRow, TKey> (this EnumerableRowCollection<TRow> source, Func<TRow, TKey> keySelector)
		{
			return OrderByDescending<TRow, TKey> (source, keySelector, Comparer<TKey>.Default);
		}

		public static OrderedEnumerableRowCollection<TRow> OrderByDescending<TRow, TKey> (this EnumerableRowCollection<TRow> source, Func<TRow, TKey> keySelector, IComparer<TKey> comparer)
		{
			return OrderedEnumerableRowCollection<TRow>.Create<TRow, TKey> (source, keySelector, comparer, true);
		}

		public static EnumerableRowCollection<S> Select<TRow, S> (this EnumerableRowCollection<TRow> source, Func<TRow, S> selector)
		{
			return new EnumerableRowCollection<S> (Enumerable.Select<TRow, S> (source, selector));
		}

		public static OrderedEnumerableRowCollection<TRow> ThenBy<TRow, TKey> (this OrderedEnumerableRowCollection<TRow> source, Func<TRow, TKey> keySelector)
		{
			return ThenBy<TRow, TKey> (source, keySelector, Comparer<TKey>.Default);
		}

		public static OrderedEnumerableRowCollection<TRow> ThenBy<TRow, TKey> (this OrderedEnumerableRowCollection<TRow> source, Func<TRow, TKey> keySelector, IComparer<TKey> comparer)
		{
			return OrderedEnumerableRowCollection<TRow>.AddSort<TRow, TKey> (source, keySelector, comparer, false);
		}

		public static OrderedEnumerableRowCollection<TRow> ThenByDescending<TRow, TKey> (this OrderedEnumerableRowCollection<TRow> source, Func<TRow, TKey> keySelector)
		{
			return ThenByDescending<TRow, TKey> (source, keySelector, Comparer<TKey>.Default);
		}

		public static OrderedEnumerableRowCollection<TRow> ThenByDescending<TRow, TKey> (this OrderedEnumerableRowCollection<TRow> source, Func<TRow, TKey> keySelector, IComparer<TKey> comparer)
		{
			return OrderedEnumerableRowCollection<TRow>.AddSort<TRow, TKey> (source, keySelector, comparer, true);
		}

		public static EnumerableRowCollection<TRow> Where<TRow> (this EnumerableRowCollection<TRow> source, Func<TRow, bool> predicate)
		{
			return new EnumerableRowCollection<TRow> (Enumerable.Where<TRow> (source, predicate));
		}
	}
}
